Western Funding Inc Las Vegas, NV Constant Collection Calls for Late Fee's and not payment Las Vegas Nevada

I was ill and had gotten behind on a few payments, but when health got better I was able to pay online and when I do it gives me the amount of my payment.  I paid the payment full every time as it does not let you pay a different amount.  But then I started getting collection calls and several a day everyday.  I am still getting them even after talking to them many times and telling them I have always paid the payment in full.  One supervisor screamed at me and when we got done offered to waive half the amount as it is late fee's they are trying to collect on.  I explained that I felt collection calls were for payments owed, not late fee's only.  They are still calling everyday, so I told them that I was going to record the call and they got nasty and said I do not authorize you to record this call, even after telling me that my call was being recorded.  I am trying to see if I can get an attorney as I feel it is illegal to harrass me over late fee's as all my payments are paid and I continue to pay my car payment every month.  Terrible company to deal with and it was not my choice as original company sold my loan to them.